a final boss

/FY-nl boss/ medium • Origin: Gaming slang; 1990s.

The ultimate challenge or most difficult opponent in a game or situation.

That exam was the final boss of college.

ultimate challenge,end boss

Used metaphorically for tough life tasks.

We’re going full send on this launch.

Sometimes you just need a good cry.

Your fit is clean today.

We can’t slack on this deadline.

Her constant complaining is a bit much.

Don’t forget your lightstick for the show.